Variable gain amplifier with adjustable upper frequency limit

Details Variable gain amplifier with adjustable upper frequency limit Variable gain amplifier with adjustable upper frequency limit

1976-09-27

1978-02-07

Mullins, James B.

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

330109, H03F 136

Patent

active

040729060

ABSTRACT:
An amplifier circuit including a differential amplifier and having an effective transmission frequency band delimited by a lower limit frequency which can be varied by application of a control voltage is also given a defined upper limit frequency by connecting a resistance in series with a frequency dependent impedance between an inverting input of the amplifier and a point at the circuit reference potential. The value of the resistance can be adjusted to provide the desired upper limit frequency value and can be varied to change that frequency value.

REFERENCES:
patent: 2264715 (1941-12-01), Rohr et al.
patent: 3432774 (1969-03-01), Fick
patent: 3628129 (1971-12-01), Riley
patent: 3769612 (1973-10-01), Yamazaki
patent: 3835418 (1974-09-01), Gilbert
patent: 3967209 (1976-06-01), Skoures et al.

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